This has already been discussed, but I think it warrants reconsideration.
Jeff's answer, in particular:
So I'd only migrate questions where the question is extremely and unavoidably Ubuntu-centric, and cannot be generalized to other *nixes in any meaningful way.
After this question was migrated and looking at this question1, I realized that it is becoming increasingly difficult to keep track of where Ubuntu has deviated from other *nixes in general, and Debian specifically. And this trend seems likely to only accelerate.
Should the cognitive overhead of trying to keep track of those changes be carried here, or should *buntu questions just be migrated across to where the real depth of expertise with that family of distros resides?
And could we please have a radio button for it on the close page, as per SO?
1. Which I got wrong.
Note This question could also be a thinly veiled lament for my failing powers of memory—or lack of diligence in keeping track of Ubuntu's innovation, either option definitely holds...